Waterproofing Wood Protector No. 300

Waterproofing Wood Protector No. 300

This clear waterproofer’s 100% acrylic formula offers protection from rain and harmful UV rays for up to 1 year on decks and 2 years on fences and siding. Cleans up easily with soap and water and is also mildew resistant.

Tech Data Sheet HERE

Available In

  • Waterproofing Wood Protector No. 300 - MSDS


Exterior, properly prepared, unsealed wood surfaces such as: Decks, Railings, Shakes, Shingles, Siding, Roofs, Fences, Planters and Wood Patio Furniture.


(The following steps and products are recommended for best results.)

  • Use a product such as BEHR Premium™ NO. 64 Wood Stain & Finish Stripper to remove loose wood fibers, latex, oil-based and 100% acrylic coatings on new or weathered wood.
  • BEHR Premium NO. 63 All-In-One Wood Cleaner MUST be used following NO. 64 to clean, brighten & neutralize wood.
  • When NO. 64 is not needed, use a product such as NO. 63 to clean and brighten the wood surface and to remove light to medium stains caused by mold, mildew, algae & fungus.
  • On new wood, use a product such as NO. 63 to remove mill glaze and open the pores of the wood. Rinse thoroughly and allow to dry before coating. Lightly sand any remaining wood fibers/fuzz.


(For best results, a pad applicator is recommended over large areas.)

  • Must apply between 40-90˚F (4.5-32˚C). Do not use if rain is expected within 24 hours. The wood surface must be completely dry before application.
  • Intermix multiple containers to ensure color uniformity. DO NOT THIN PRODUCT.
  • Stir product occasionally throughout application. Test product for penetration and color on a small hidden area before proceeding.
  • Use a nylon/polyester brush for areas requiring more accuracy. Use of rollers should be limited to rough surfaces only.
  • Use 3/8” nap or longer when appropriate. A high quality pump sprayer with a variable tip or an airless sprayer with a .015 - .019" tip may be used.
  • Work in small sections lightly saturating the surface and immediately back-brush or use pad applicator to eliminate puddling, remove excess and evenly distribute the finish.
  • Maintain a wet edge when applying. Apply product end-to-end or to board lengths to prevent lap marks.
  • Over application of finish will lead to surface failure including peeling and cracking. Avoid applying finish too heavily. For optimum performance, coat all six sides of wood.


  • 1-2 hours before recoat. Wait 24-48 hours before foot traffic. Allow 72 hours for full cure.

  • For disposal of empty containers and unused product, contact your household refuse collection service.

    If you scrape, sand or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log on to

    WARNING! Sanding or scraping pressure-treated lumber may be hazardous; wear appropriate protection.

    Behr Waterproofing Wood Finish contains a mildewcide and will protect wood from water damage for 2-4 years. This product from Behr Paints and Stains can be applied to damp wood in temperatures as low as 40°C. Product safety information is readily available from